import { constantRoutes, menuRoutes } from '@/router'
import Layout from '@/layout/index'
import ParentView from '@/components/ParentView'
const permission = {
  state: {
    routes: [],
    addRoutes: [],
    defaultRoutes: [],
    topbarRouters: [],
    sidebarRouters: [],
  },
  mutations: {
    SET_ROUTES: (state, routes) => {
      state.addRoutes = routes
      state.routes = constantRoutes.concat(routes)
    },
    SET_DEFAULT_ROUTES: (state, routes) => {
      state.defaultRoutes = constantRoutes.concat(routes)
    },
    SET_TOPBAR_ROUTES: (state, routes) => {
      state.topbarRouters = routes
    },
    SET_SIDEBAR_ROUTERS: (state, routes) => {
      state.sidebarRouters = routes
    },
  },
  actions: {
    // 生成路由
    GenerateRoutes({ commit }, userPermissions=[]) {
      return new Promise((resolve) => {
        var tempRoutes = filterRoutesByCodes(JSON.parse(JSON.stringify(menuRoutes)), userPermissions)
        const sdata = JSON.parse(JSON.stringify(tempRoutes))
        const rdata = JSON.parse(JSON.stringify(tempRoutes))
        const sidebarRoutes = filterAsyncRouter(sdata)
        const rewriteRoutes = filterAsyncRouter(rdata, false, true)
        rewriteRoutes.push({ path: '*', redirect: '/404', hidden: true })
        commit('SET_ROUTES', rewriteRoutes)
        commit('SET_SIDEBAR_ROUTERS', rewriteRoutes)
        commit('SET_DEFAULT_ROUTES', sidebarRoutes)
        commit('SET_TOPBAR_ROUTES', sidebarRoutes)
        resolve(rewriteRoutes)
      })
    },
  },
}

function filterRoutesByCodes(routers, userPermission = []) {
  if (routers.length === 0 || userPermission.length === 0) return []
  var havePermission = false
  return routers.filter((route) => {
    if (route.children) {
      route.children = filterRoutesByCodes(route.children, userPermission)
    } else {
      if (route.auth) {
        var code = route.auth.code
        if (Array.isArray(code)) {
          const intersection = code.filter((item) => userPermission.includes(item))
          if (route.auth.logic && route.auth.logic.toLowerCase() === 'and') {
            havePermission = intersection.length == code.length
          } else {
            havePermission = intersection.length > 0
          }
        } else {
          havePermission = userPermission.filter((x) => x === code).length > 0
        }
        return havePermission
      }
    }
    return havePermission || route.children.length > 0
  })
}
// 遍历后台传来的路由字符串，转换为组件对象
function filterAsyncRouter(asyncRouterMap, lastRouter = false, type = false) {
  return asyncRouterMap.filter((route) => {
    if (type && route.children) {
      route.children = filterChildren(route.children)
    }
    if (route.component) {
      // Layout ParentView 组件特殊处理
      if (route.component === 'Layout') {
        route.component = Layout
      } else if (route.component === 'ParentView') {
        route.component = ParentView
      } else {
        route.component = loadView(route.component)
      }
    }
    if (route.children != null && route.children && route.children.length) {
      route.children = filterAsyncRouter(route.children, route, type)
    } else {
      delete route['children']
      delete route['redirect']
    }
    return true
  })
}

function filterChildren(childrenMap, lastRouter = false) {
  var children = []
  childrenMap.forEach((el, index) => {
    if (el.children && el.children.length) {
      if (el.component === 'ParentView') {
        el.children.forEach((c) => {
          c.path = el.path + '/' + c.path
          if (c.children && c.children.length) {
            children = children.concat(filterChildren(c.children, c))
            return
          }
          children.push(c)
        })
        return
      }
    }
    if (lastRouter) {
      el.path = lastRouter.path + '/' + el.path
    }
    children = children.concat(el)
  })
  return children
}
export const loadView = (view) => {
  // 路由懒加载
  return (resolve) => require([`@/views/${view}`], resolve)
}

export default permission
